There are several types of turquoise crystals that are known for their unique characteristics and properties. Some of the notable types include: 1. Persian Turquoise: Also known as “Iranian Turquoise,” it is highly regarded for its intense blue color and high-quality characteristics. It has been highly valuable throughout history. 2. Sleeping Beauty Turquoise: This type of turquoise is named after the Sleeping Beauty mine in Arizona, USA. It is known for its vibrant sky blue color and smooth, even texture. 3. Kingman Turquoise: Mined in Arizona, USA, Kingman turquoise is renowned for its beautiful blue color with dark matrix patterns. It is often used in Native American jewelry. 4. Chinese Turquoise: Mined in China, this turquoise showcases a range of colors, including blue, green, and yellow. It is highly sought after for its unique and exotic appearance. 5. Bisbee Turquoise: Named after the Bisbee mine in Arizona, USA, this type of turquoise is known for its deep blue color and beautiful spider-web matrix patterns. It is considered one of the most collectible turquoise varieties. 6. Campitos Turquoise: Mined in Sonora, Mexico, Campitos turquoise is highly valued for its light blue to medium blue color and minimal matrix. It is known for its consistent quality and availability. 7. Carico Lake Turquoise: Found in Nevada, USA, Carico Lake turquoise features a light to medium blue color with a green undertone. It is known for its unique coloration and high water content. These are just a few examples of the various types of turquoise crystals that exist. Each type has its own unique characteristics and appeal to collectors and crystal enthusiasts.